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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
REM Sleep after approximately 6 hours of sleep. EEG waveforms of brain activity during sleep showing the individual is almost in REM sleep, a fact that is obvious when looking at both the EEG and fMRI scan, but it can also been seen in this small section which identifies a scan used in laboratory testing.